218 



46. Cardium substriatum, Conr. Journ. p. 228. pi. 17. t'- 2. 



Hab. San Diego, paludibus luteosis. Mus. Nutt. 



Closely resembles the young of C. elatum : differs from C. Mor- 

 toni, Conr., in being less ventricose, and in its striae and serrate 

 margin. 



47. LuciNA BELLA, Conf. Joum. p. 254. pi. 19. f. 11. 

 = L. pecten, var. teste Jay. 



Hab. San Diego, in paludes limosas, haud rare. Mus. ? Jay. 



48. LuciNA Californica, Conr. Journ. p. 255. pi. 20. f. 1. 

 Hab. San Diego, una cum prsecedente ; rare. Mus. Jay. 



- 49. LuciNA NuTTALLi, Conr. Joura. p. 255. pi. 20. f. 2. 



Hab. San Diego, una cum praecedente. Mus. Nuttall. 

 This beautiful species is recognized by its winged growtli. 



— 50. DiPLODONTA ORBELLA, Gould. 



Lucina orbella, Cal. & Mex. Shells, p. 22 ; vide B. M. Maz. Cat. 

 p. 102. no. 150 ; P. Z. S. 1856, p. 202. 



Hab. Santa Barbara, in sestuario limoso. Mus. Nuttall, Gould. 



51. Anodon NuTTALLiANA, Lea, Trans. Am. Phil. Soc. vol. vi. 

 pi. 20. f. 62. 



Hab. In flumine Wahlamat, Oregon, Mus. Nutt., Jay. 



52. Anodon Oregonensis, Lea, Trans. Am. Phil. Soc. vol. vi. 

 pi. 21. f. 67. 



Hab. In flumine Wahlamat, Oregon. Mus. Jay. 



53. Anodon Wahlamatensis, Lea, Trans. Am. Phil. Soc. vol. vi. 

 pi. 20. f. 64. 



Hab. In flumine Wahlamat, Oregon. Mus. Jay. 



54. MoDioLA CAPAx, Cour. Journ. p. 242; B. M. Mazatlan Cat. 

 p. 120. no. 170, q. v. 



Hab. San Diego, inter paludes limosas. Mus. Brit., Curaing, 

 Gould, &c. 



55. MoDioLA RECTA, Conf. Journ. p. 243. pi. 19. f. 1. 



Long. 2-1, lat. -94, alt. '8. 



Hab. Sta. Barbara, rarius. Mus. Gould. 



The measurements are taken from a very fine specimen in Dr. 

 Gould' s collection, in \diich the epidermis is posteriorly clothed with 

 squamose hairs. 



